Basic triarylmethane dyes



Patented Feb. 27, 1940 Leverkusen I. G.- -Werk, Germany,-assignors to General Aniline &. Film Corporation, av corjporation of Delaware No Drawing; ApplicationMarch '23, 1939, Serial No. 263,670. In Germany .March 28, 1938 7 Claims." (01. 260-491) The present invention relates to basic dyestuffs of the triarylmethane series and to a process of preparing the same. v I

It has been known'thatjby introduction of higher alkyl radicals, such as propyl, butyl groups and others into the triaryl methane molecule,

dyestufislare obtained which, in comparison with the known dyestufis containing, for instance, methyl or ethyl radicals, show an increase of the clearness ofthe shades and a desired shifting of the shade to the long wave side of the spectrum.

In U. S. Patents 1,876,842 and 1,959,455 dyestuffs of the diaminotriphenylmethane series are described, which are obtained from benzaldeh-yde disulfonicacids and higher monoalkylated arylamines. 1 1 I In the series of the basic triarylmethane dyestuffs the solubility decreases by introducing higher alkyl radicals with increasing length and arborescence so strongly" that a technicalnuseis no longer possible. Indeed, it is possible, to overcome this deficiency .by the process described in U. S. Patent 1,898,523,'i. e. by using in the synthesis of the dyestuffs such arylamines as contain besides a higher alkyl radical a hydroxy alkyl group linkedto the nitrogen atom; however, in this way only hydroxy-alkyld'yestufis are obtainable, while all other possibilities, chiefly also the use of secondary aromatic amines with higher alkyl radicals, are excluded.

Now the surprising observation has been made that likewise well soluble higher alkylated basic triarylmethane dyestuffs with the desired properties are also obtained, even if hydroxy 'alkyl radicals are absent, by selecting the components for their preparation in such a way that the dyestuffs formedvc'ontain at least once in the molecule a secondary butyl radical linked to the nitrogen atom. Thiscouldbe the less foreseen,

since just branched chains as, for instance, the

isopropyl isoand tertiary butylgroupswreduce the solubility so that often not e'ven-theleuco compounds can be satisfactorily. oxidized, to the dyestuffs. 1

This property of the secondary but yl group to increase the solubility is, therefore, an exception which could not be expected. This could not be inferred from U. S. Patent 1,876,842, because this specification relates to the manufacture of acid dyestufis, the solubility of which is caused by fprimary but'yl-, ijso- ,and tertiary shades.

'tion is complete.

the presence of several sulfonic acid groups in cient for practical purposes is obtained by means of hydroxy alkyl groups. Thus, it has also been proved that'the secondary-butyl-hydroXy-alky dyestuffs show in comparison with the isomeric butyl-hydroxyalkylf dyestuffs a better solubility.

the molecule' Nor does U. S.Patent 1,898,523 disclose 'this ,knowledgafor' in the'process described mars specification only the normal primary butyl radical is used and a solubility jsuffir It is now possible not only to combine the butyl radical. with alkyl groups other than the hydroxy alkyl radicals, but also to prepare, for

the ,firsttime, well soluble'basic triarylmethane dyestuffs from secondary mono-butyl-aryleae mines and thus to utilize technically the favorable. effect of the higher alkyl radicals in, such dyestuffs. I

The new dyestuffs can be prepared by methods which areusually employed in the, manufacture of triarylmethane dyestuffs; A special advantage hereby is the fact that the dyestulfs areobtained in a very good yield. I

In comparison with the combinations hitherto known the new, dyestufis mostlyshow clearer" The fastness to light of the dyeings and of the precipitations with lake-forming agent's,

suchas tannin, tartar emetic, iullers earth,-phosp pho-tungsto-molybdic acids and so on, is, compared with the fastness to light of the best prodf nets on the market-substantially increased;

' The following examples-illustrate the inven partsbeing'by weight.

Example 1" 81.4 parts of sec. butyl-oetoluidineand 35.4 parts of o-chlorobenzaldehyde areheated in a solution of 15 parts of water and 31 parts of sulphuric acid B. to 0. until condensaif necessary. distilling with steam in order to remove excess base or aldehyde, the easily solidi-I I fying colorless leuco-base is obtained in almost from phuric acid with lead peroxide and filtering from the formed lead sulphate, the dyestuif is salted After dilu'ting with water and w out and if necessary redissolved from water. The

. dyestuff is obtained as a red bronze, easily soluble resin which during drying solidifies to greenish crystals. It corresponds to the following formula:

On cotton mordanted with tannic acid greenish blue dyeings are obtained which are distinguished by a particular clearness, beautiful evening. color and better fastness to perspiration and water than the dyeings oi the corresponding dyestufis containing lower alkyl radicals." Compared with the analogous dyestufi from normal butyl-o-tol-,

uidine. the new dyestufi shows the essential advantage of a good solubility; moreover, it' is clearer.

Outstandingly brilliant blue dyeings are also obtained on wool, silk and acetate artificial silk.

.The color lake obtained with phosphor-- .tungsto-molybdic acid is distinguished by an extraordinary clearness, very beautiful evening color, very good fastness to lime and spirit and a distinctly better fastness to light over the known products on the market.

Example 2 If in Example 1 o-chlorobenzaldehyde is replaced by the same quantity of p-chlorobenzaldehyde,.a clear green is obtained the dyeings of which'are distinguished by a better fastness to water and a distinctly better fastness to light in comparison with the dyeings of thedyestuif from benzaldehyde and dimethyl aniline. The dyestuff is essentially better soluble than the isomeric dyestuff from p-chlorobenzaldehyde and normal butyl-o-toluidine.

Example 3 l. OGaH dyes essentially clearer shades than the corresponding dyestuff containing normal butyl radicals which latter on account of its low solubility goes only insufficiently and streakily' on cotton mordanted with tannic acid.

' Example 4 parts of p-diethylaminobenzaldehyde and 20 parts ethyl-sec.-butylanilin e are boiled in the usual way in a solution of 12 parts of concentrate hydrochloric acid in 120 parts of 'water with stirring and reflux until the reaction is complete.

Working up and oxidizing is carried out as described in Example 1. A golden shining resin of very good solubility is obtained; it corresponds to the formula mo H50,

r m- 11i I -0H-0m JHg a c. (3113 (3113 CM 6113 mom and dyes mordanted cotton clear violet shades. The dyestuif dyes mordanted cotton brighter and more reddish shades than the isomeric dyestuff from ethyl-normal-butylanilinei Example 5 I 17.5 parts of ethyl-sec.-butylaniline and '1 parts of o-chlorobenzaldehyde"are heated with 3 parts of water and '6 parts of sulphuric acid 60 B. with stirring until the condensation is complete. The leuco compound is isolated in the manner described above.- Afteroxidizing and working up in the usual way by salting out with sodium sulphate the dyestuff is obtained as a red 1 bronze resin which dyes themordanted fiber pure green shades of greater clearnes's than the known dyestufi' from o-chlorobenzaldehyde and dimethylaniline. The new dyestuff which corresponds to the formula I OH:

possesses a better solubility than the analogous dyestuff from ethyl-normal-butylaniline.

Example 6 54 parts of tetra methyldiaminobenZhydrQI and 38 parts of ethy1-sec.-butylaniline are boiled with 54 parts of 50% sulphuric acid for 24 hours with stirring and reflux. The excess base, ifany, it

is distilled off with steam from sodium carbonate alkiline medium, the remaining leuco compound is filtered with. suction and crystallized from methyl alcohol. The leuco compound melts at 113 C. The dyestuff obtained by oxidizing with lead peroxide dyes cotton mordanted with tannic acid very clear violet shades. The dyestuff corresponds to the formula and its dyeings areredder and clearer than the dyeings of the dyestuff from tetramethyldiaminobenzhyd-rol and ethyl normal butylaniline and keep their shades better under the influence of light.

The same dyestuif is obtained when Michlers ketone is condensed in known manner with ethylsec.-butylaniline.

Example 7 j 12 parts of the aldehyde of the formula and 19.2 parts of sec.butyl-o-toluidine are heated with 140 parts of water and 15 parts of concentrate hydrochloric acid for 70 hours, with stirring and reflux and the leuco compound is isolated in the usual way. Melting point 60 C.

The dyestufi obtained by oxidation dyes cotton mordanted with tannic acid redder shades than Crystal Violet P, and is well soluble, although it contains 3 secondary butyl radicals. The new dyestufi corresponds to the following formula 7 CH: CH:

CH3 H H CH3 teat :latH Hg 2 10. (:H: 033 \CM (313:

- N C \CH.CH:.CH3

Example 8 20 parts of hydroxy-ethyl-sec.-butylaniline and 7 parts of o-chlorcbenzaldehyde are heated with 3 parts of water and 6 parts sulphuric acid 60 Be. to C. with stirring until the condensation is complete. The leuco compound obtained as described in Example 1 melts after recrystallization from methyl-alcohol at C.

After axidizing and Working up in the manner described, by salting out with sodium sulphate the dyestuff is obtained as a red bronze resin which dyes the mordanted fiber bluish green shades of greater clearness than the known dyestufi from o-chlorobenzaldehyde and dimethylaniline. The new dyestufi which corresponds to the following formula- HOCHzIJHz CH2.CH2OH HaC--OHN Ai een-om (1111 I a e. (13H:

pcssessesa better solubility than the isomeric dyestuff from normal primary butylaniline.

' Example 9 i1 partsofhydroxy-ethy-sec.-butyl-m-toluidine are stirred with 10 parts of 30% formaldehyde and 0.5 part of 30% hydrochloric acid at 80 C. until the condensation is complete, thereupon dissolved in 200 cc. 10% sulfuric acid and filled up to 1000 cc. with ice and water. A paste containing 24 parts of lead peroxide is added, thereto, at 0 C., then the hydrol solution, which shows in the beginning a bluish coloration, is decolorized and 16 parts of sulfuric acid66 B. and thereafter 16 parts of hydroXy-ethyl-sec.-loutylm-toluidine are added and condensed on the boiling water bath until the reaction is complete. Now the lead sulfate is filtered off and the solution is run into very dilute excess sodium hydroxide solution, whereby the leuco compound is separated in the form of a resin. After pouring off the sodium hydroxide solution the leuco compound is ground with methyl alcohol and is thus obtained in form of colorless crystals of the melting point 136-187 C. In order to oxidize the product it is dissolved in dilute sulfuric acid,

oxidized with the calculated quantity of lead peroxide, freedfrom lead sulfateby filtration and salted out by adding sodium sulfate. The dyestufi of the following formula nooinorn ornornon \N =NCH.CHs omen O ac. (3H2 CH2 1 CH3 CH3 H30 CH3 iii is obtained as bronze-colored powder which dyes wherein X stands for one of the group consisting of hydrogen, alkyl and hydroxyalkyl.

2. As new products basic triarylmethane dyes containing in their molecule at least twice and up to three times a basic group of the formula oncmom IIS wherein X stands for one of the group consisting of hydrogen, alkyl and hydroxyalkyl. l

3. As new products basic triphenylmethane dyes containing in their molecule at least once a basic group of the formula (BELGHmCEs x wherein X stands for one of the group consisting of hydrogen, alkyl and hydroxyalkyl.

4. As new products basic triphenylmethane dyes containing in their molecule at least twice and up to three times a basic group of the formula CH5 (BIELCHLCHs X wherein X stands for one of the group consisting of hydrogen, alkyl and hydroxyalkyl.

5. As new product the basic triphenylmethane dye of the formula dyeing cotton mordanted with tannic acid clear greenish blue shades.

6. As new product the basic triphenylmethane dye of the formula dyeing cotton mordanted with tannic acid clear violet shades.

7. As new product the basic triphenylmethane dye of the formula dyeing cotton mordanted with tannic acid bright blue shades.

, WERNER WILHELM SCHEPSS. 

